abstract class

using System;

namespace ООП
{
    class Program
    {
        static void Main(string[] args)
        {

        }
    }

    abstract class Vehicle
    {
        protected float Speed;

        public abstract void Move();

        public float GetCurrentSpeed()
        {
            return Speed;
        }
    }

    class Car : Vehicle
    {
        public override void Move()
        {
            Console.WriteLine("Машина двигается");
        }
    }
}